The Cincinnati Metro system received a safety award in 2011 as a result of reducing preventable accidents and reinstating safety audits in the maintenance department among other things. Since it has been years since I've ridden a Metro bus, I can't personally speak to its on time reliability; however, I believe that they are fairly reliable within 5-10 minutes of scheduled times. Of course, it areas with more bus routes, the service might be better than in outlying areas with longer distances, more traffic, and less passengers. The main Metro hub downtown, Government Square, recently unveiled a new real-time status boards for the buses, so that you have a better idea of when your bus will be coming. They will also be installing this real-time information at two other locations, as well as including it on their website and offering smartphone apps in 2013.